陕北黄土丘陵地区土壤侵蚀强度遥感分析方法探讨

在地形破碎的黄土丘陵地区,利用航空遥感图像分析沟谷密度、沟谷发育阶段、地貌形态及其与土壤侵蚀强度之间的相关性,收到了良好的效果。研究表明,包括切沟在内的黄土丘陵区的沟谷密度值可高达20 km/km~2以上;黄土冲沟的发育阶段不同,其侵蚀强度也相应变化;切沟发育最活跃和最密集的地段,其侵蚀强度也最大。根据土壤侵蚀总量与侵蚀强度之间的相关,建立了土壤侵蚀模型,并利用遥感图像划分了土壤侵蚀综合类型,从而可用多元回归分析方法求算各侵蚀类型的侵蚀强度,为预测区域侵蚀总量开辟了新的技术途径。

Discussion of Methods of Remote Sensing Analysis on Erosion Intensity in Hilly Loess Region of North Shaanxi Province

In the topographically-broken gullied and hilly region of the loess plateau, we analyse the relationship among the density of gully, the developmental stage of gully, geomorphic form and soil erosion intensity with aerial photograph, and get some better results. Density of gully in this area is so high that it can reach 20km/km2; the erosive intensity varies with the different gully developmental stage; at the most active and densely gullied area, it has the most erosive intensity. According to the relationship between soil erosion total and erosion inensity, we set up a soil erosive model, divide multiple types of soil erosios using remote sensing image, measure erosive area and deposit total, and calculate the erosion intensity of varied erosive types with multivariate regression analysis methods, Finally we discuss some new teachnical ways to forecast regional erosive total.